Question

1. Which type of leaf you will use to study comparative rates of transpiration? Why?​

Answer 1

Answer:

compound leaf

as these leaves have some tiny pores in it called stomata

Answer 2

Answer:

Dicot leaves is used to study comparative transpiration rates because they have different numbers of stomata on each surface.

Explanation:

Transpiration

Transpiration is the process by which water moves through a plant and evaporates from aerial parts such as leaves, stems and flowers. Plants need water, but only a small amount of water taken up by the roots is necessary for growth and metabolism. The remaining 97-99.5% is lost through transpiration and dripping.

Leaf is the main photosynthetic organ of the plant. Epidermis is present on both sides of the leaf, i.e., above and below. Dicots have dorsoventral leaves. This means they stay horizontal and sunlight hits them horizontally. The upper surface is called the ventral surface or the adaxial surface. The lower surface is called the axial surface or dorsal surface. As the name suggests, both surfaces differ in color and anatomy. The upper surface is darker in color. Monocotyledons have broad-sided leaves. This means that these leaves are oriented vertically towards the sunlight. Thanks to this, both surfaces receive the same amount of sunlight.

Dicot leaves have fewer stomata on the adaxial surface than on the abaxial surface. Since, the number of stomata is less on the upper surface, the rate of transpiration from the upper surface is also lower. This is because when the number of stomata is more on the upper surface, it is exposed to more sunlight, which causes more evaporation and therefore more water loss. Thus, the rate of evaporation is lower on the upper surface of the leaf because there are fewer stomata and more on the underside of the leaf because there are more stomata. But in monocots, because both sides of the leaf have an equal number of stomata, the rate of evaporation is equal on both the upper and lower surfaces of the leaf.

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